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Influence of the continuous addition of zero valent iron (ZVI) and nano-scaled zero valent iron (nZVI) on the anaerobic biomethanation of carbon dioxide

Authors
Dong, DandanChoi, Oh KyungLee, Jae Woo
Issue Date
15-Feb-2022
Publisher
ELSEVIER SCIENCE SA
Keywords
Biomethanation; Anaerobic digestion; Zero valent iron; Nano-scaled zero valent iron; Electron donor; Methanogenesis
Citation
CHEMICAL ENGINEERING JOURNAL, v.430
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING JOURNAL
Volume
430
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/140465
DOI
10.1016/j.cej.2021.132233
ISSN
1385-8947
1873-3212
Abstract
Both zero valent iron (ZVI) and nano-scaled ZVI (nZVI) have the potential for biomethanation of CO2 under anaerobic condition, but when they were continuously added to a semi-continuous anaerobic bioreactor, exhibited different effects on the microbial mechanisms and system performances. When ZVI and nZVI were continuously added, 33.40 and 11.52 % of the dissolved input CO2 were transformed into CH4, respectively. The abiotic corrosion rate and H-2 evolution rate by ZVI were 27 times lower than those by nZVI. Active bio-methanation occurred earlier in the period of operation with nZVI, and later with ZVI. As nZVI accumulated in the bioreactor, biomethanation stopped, without utilization of both the H-2 and VFAs generated. Based on mi-crobial community analysis, biomethanation by using both irons depended on hydrogenotrophic methano-genesis, but in the case of ZVI, direct use of electron from ZVI by methanogens was also significant. Based on the estimation of CO2 conversion, ZVI could be more effectively and stably used for biomethanation compared to nZVI, with less loss in the form of chemical precipitates
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